Arc-lamp.



G. G. HUGHES.

ARC LAMP.

APPLICATION FILED 13.13, 1905.

Patented May 4, 1909.

ll 20 "It 69 ml v 29 Grim-mar! UNITED STATES PATENT ()I FIOlF.

(QZHA HLES (J. H UUHES, F ll-llLADlliLPlUA, PENNSYLVAN IA ABC-LAMP.

To all whom it may concern:

Be it known that l, CHARLES C. HUGHES, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia, State ofPennsylvania, have invented certain new and useful llnprovenicl'lts inAre- Lamps; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appcrtains to make and use the same.

This invention relates to are lamps of the hot wire type and has for itsobject to provide a cheap and simple means for cooperation with the hotwire for raising and lowering the carbon and for engaging and releasingthe carbon.

In the accompanying drawings: Figure 1 is a view in elevation of thelamp. and, Fig. 2 is a similar view, but taken in a vertical plane atright angles to the plane of Fig. 1. ig. 3 is a detail sectional viewshowing the manner of electrically connecting the hot wire with theflexible conductor.

Referring more specifically to the drawings, the numerals 5 and 6 denoteupper and lower plates, respectively, which are held in fixed spacedrelation by means of standards 7, there bein" connected with the upper)late 5 the usual ranger 8 by means of WhlCl the lamp may be suspended,and with the lower plate 6, the usual globe supporting device 9.

Extending downwardly from the lower plate 6 is the usual arm 10 whichcarries at its lower end the usual collar 11 for the reception of thelower end of the lower carbon of the lamp.

Secured to the under side of the 11 per plate 5 is a plate '12 to whichis scour the upper-ends of depending uide rods 13, the said rods beingconnected at their lower 2 ends to brackets 14 which extend inwardly ifrom the standards 7 and overlap at their meeting ends. A socket 15 isarranged for the reception of the upper end of the upper 1 carbon 10 ofthe lamp. the said carbon heiiw i held in pluceby means of a set-screw1i whichserves' also as ameans for fastenin the wine 45, as will bepresently explainedi Extending from diametrically opposite i points uponthe collar '15 are tongues 18 which are provided with apertures throughI which extend the rods 13, it being. under- I stood that the said rodsserve to his the movement of the upper carbon an that the said carbonextends through an opening Specification of Letters Patent.

Application flled April 13, 1906.

Patented May 4, 1909.

Serial No. 311.608.

formed in the brackets l-l; to further guide the same.

Mounted upon the upper face of the upper plate 5 is a binding post 19having a depend- 'ing arm 20 to which is connected an un le bracket 21.The angle bracket 21 inclu es a horizontal portion in which is aperforation that loosely receives a threaded stem 60 with the upper endportion of which is engaged a thumb nut 61 which when turned in onedirection draws the stem upwardly through the perforation and whenturned in the opposite direction, permits the stem to pass downwardlythrou h the perforation. Connected with the three ed stem is one end ofa conductor wire 22 which extends (1OWI1 wardly as shown in Fig. 1 andaround an in sulated roller 23 journaled upon a plate 2% which issecured to the adjacent one of the standards 7 adjacent: its lower endand forms a convenient means for securing the roller 23 to the standard.The wire 22 then extends inwardly and over a. similar roller 25 which isjournaled in a bearing bracket 26 secured to the under side of the topplate 5 and over a third roller 27 journaled in a. bearing bracket 28which is also secured to the under side of the said plate. After passingover the roller 27, the wire extends downwardly and around an insulatedroller 29 and thence upwardly and is connected to an insulated pin 29carried by a. bracket which is connected to the top plate 5. The roller29 is 'ournaled in a yoke 30 which is pivotally connected to one end ofan arm 31 which is pivotally mounted upon a plate 32 which is secured tothe adjacent one of the standards 7, the said connection between theyoke-bearing and the pivoted arm being made adjustable by providing thearm with a series of openings 3., through which may be interchangeablyeui ,Q aged the pivot pin which connects the menr hers. The plate 32 isprovided with abracket arm 3-! to which is secured the lower end of ailate 33. the upper end of which is bent aterally at right anglesprovided with an aperture through which is loosely engaged a threadedstem 36 upon which is engaged an adjusting nut 37 which latter bearsagainst the said portion of the plate 3.7. helical spring 38 isconnected at one of its ends to the lower end of the stem 36 and isarranged for the engagement of its other end with one of a series ofopenings 39 formed through the said arm.

Slidably disposed upon the 11 per carbon to of the lamp is a sleeve 40which is provided adjacent its lower end and u on 0p 0- site sides withpairs of s accd fiiigers the respective tween which are receive guiderods 13 to prevent turning of the sleeve upon the carbon 16. The sleeveis also provided with a pair of spaced aper tured ears between which ispivoted one end of an arm 41, the point of pivotal connection of thesaid arm with the sleeve being adja cent what may be termed the lowerlongi tudinal edge of the arm for a purpose to be hereinafter described.The arm 41 rests against the end of the pivoted arm 31, the said end ofthe arm 31 bein preferably reduced to form a stem 42 and t ie end of thearm 41 is preferably weighted as at 43 to normally hold it against thestem 42. The sleeve 40 is provided at a point in alinement \vith tlieupper end of the arm 41 with a slot 44 through which the said upper endof the .arm may project to contact with the upper carbon 16, it beingunderstood that the end of the arm contacts frictionally with the saidcarbon when the arm is raised by reason of the location of the pivotpoint of the arm adjacent the lower longitudinal edge thereof, and itwill also be understood that when the arm is lowered, its'upper end willbe moved out of engagement with the upper carbon 16 thereby permittingdownward movement of the said carbon.

Connected to the binding post 17 is one end of a conductor wire 45 whichwire is connected at its opposite end to the bindi-n post 29'. The arm10 has its .111PP8I end reduced and screw threaded and engaged throughthe lower plate 6 and engaged upon the said screw-threaded end of t earm-1s a nut 47 which to ether therewith furms a binding ost tor teattachment of one and of a con uctor wire48 which is connected'at itsopposite end to ti Binding st 49 carried by he upper plate 5. Lea ingfrom the binding posts 19 and 49 are the usual wires 50 by means ofwhich the current is con veyed to the lamp.

It will be readil seen from the foregoing that the current 0 electricitypasses throu the wire .22 to the wire 45 and through t e same to theupper carbon 16 and that the current is conveyed from the upper car onto the lower carbon, thence through the arm 10 and the wire 48.

When not in use, the upper and lower carbons are in contact with eachother but as soon as the electric current asses into the lamp, the wire22 becomes eated and expansion takes place which results m a lengtheningof the wire allowing the sprin r 38 to move the end of the arm 31 towhici it is connected upwardly and cause the upper end of the arm 41 toengage the upper carbon 16 as heretofore stated and lift the said carbonout of contact'with the lower earborn of the lamp. As the upper carbonburns aways and a greater length of are is ob tained, the wire 22becomes cooled and hence contracts, resulting in a downward move- 1 mentof the end of the pivoted arm 31. to

which the sprin 38 is connected, thereby releasing the en of the arms 41from engagement with the upper carbon of the lamp and allowing the'saidcarbon to move down wardly.

It will be noted that the clutch sleeve'is freely movable away from thebase of the lamp frame and longitudinally of the car hem andindependently of the actuating lever 31. This facilitates the trimmingof the lamp as it is only necessary to grasp the sleeve and raisejt tocarry the clutch lever away from the actuating lever when the carbonwill slide downwardly through the sleeve and into engagement with thefixed carbon. The sleeve is then released and falls by its own wei htdown the movable carbon until' the clutch lever strikes the actuatinglever and is swung into engagement with the movable carbon. Noadjustment is nec essa ry.

What is claimed is:

In an arc lamp, a supporting frame comprising upper and lower plates,and standards connecting said plates, a binding post on said frame, alateral plate secured to one of said standards adjacent its lower end,an insulated roller journaled u on the lastmentioned plate, a pair ofspace rollers suported on said upper plate in substantial ydiametrically opposite osition, a second lateral plate secured to t issecond standard, an arm pivotally mounted thereon, a yoke hearingpivotally connected to one end of said arm, a second insulated rollerjournaled in said yoke bearing, a second bindin post connected to thetop plate, and a con uctor wire extending from the first mentionedbinding post to and around the first mentioned insulated roller, thencearound the pair of spaced rollers. thence around the second insulatedroller, and thence to the second binding post.

In testimony whereof, I: atlix my signature, in presence of twowitnesses.

CHARLES 01; HUGHES. Witnesses:

HANs VVENIGER, ALEX. VVAL'raR.

